use std::process::Command;
use tempfile::TempDir;

fn arc_cmd() -> Command {
    let mut cmd = Command::new(env!("CARGO_BIN_EXE_arc"));
    cmd.env("NO_COLOR", "1");
    cmd
}

fn init_repo() -> TempDir {
    let dir = TempDir::new().unwrap();
    arc_cmd()
        .arg("init")
        .current_dir(dir.path())
        .output()
        .expect("failed to init");
    dir
}

fn commit_id(dir: &TempDir, msg: &str) -> String {
    let output = arc_cmd()
        .args(["commit", msg])
        .current_dir(dir.path())
        .output()
        .expect("failed to commit");
    assert!(output.status.success());
    String::from_utf8_lossy(&output.stdout)
        .trim()
        .strip_prefix("✓ committed ")
        .unwrap()
        .to_string()
}

#[test]
fn log_shows_single_commit() {
    let dir = init_repo();
    std::fs::write(dir.path().join("a.txt"), "hello\n").unwrap();
    commit_id(&dir, "initial commit");

    let output = arc_cmd()
        .arg("log")
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("initial commit"));
    assert!(stdout.contains("●"));
}

#[test]
fn log_shows_multiple_commits_newest_first() {
    let dir = init_repo();
    std::fs::write(dir.path().join("a.txt"), "v1\n").unwrap();
    commit_id(&dir, "first");

    std::fs::write(dir.path().join("a.txt"), "v2\n").unwrap();
    commit_id(&dir, "second");

    std::fs::write(dir.path().join("a.txt"), "v3\n").unwrap();
    commit_id(&dir, "third");

    let output = arc_cmd()
        .arg("log")
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    let first_pos = stdout.find("first").unwrap();
    let second_pos = stdout.find("second").unwrap();
    let third_pos = stdout.find("third").unwrap();
    assert!(third_pos < second_pos);
    assert!(second_pos < first_pos);
}

#[test]
fn log_fails_on_empty_repo() {
    let dir = init_repo();

    let output = arc_cmd()
        .arg("log")
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(!output.status.success());
}

#[test]
fn log_with_single_commit_range() {
    let dir = init_repo();
    std::fs::write(dir.path().join("a.txt"), "v1\n").unwrap();
    let id1 = commit_id(&dir, "first");

    std::fs::write(dir.path().join("a.txt"), "v2\n").unwrap();
    commit_id(&dir, "second");

    let short = &id1[..12];
    let output = arc_cmd()
        .args(["log", short])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("first"));
    assert!(!stdout.contains("second"));
}

#[test]
fn log_with_range() {
    let dir = init_repo();
    std::fs::write(dir.path().join("a.txt"), "v1\n").unwrap();
    let id1 = commit_id(&dir, "first");

    std::fs::write(dir.path().join("a.txt"), "v2\n").unwrap();
    commit_id(&dir, "second");

    std::fs::write(dir.path().join("a.txt"), "v3\n").unwrap();
    commit_id(&dir, "third");

    let range = format!("{}..", &id1[..12]);
    let output = arc_cmd()
        .args(["log", &range])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("first"));
    assert!(stdout.contains("second"));
    assert!(stdout.contains("third"));
}